hw/prd: Add firmware PRD handling subsystem

This change adds Processor Recovery Diagnostics (PRD) code to skiboot
firmware. This allows certain hardware RAS events to be handled by a
userspace application.

The core of the PRD code is a messaging interface to the kernel (and
onwards to userspace). PRD events are logged with the prd.c code, and
sent to the kernel as opal_msg messages. For responses to these
messages, the kernel will reply using a new OPAL call, opal_prd_msg.

Only one message is outstanding at a time; we collect events from
hardware interrupts (hooked up by subsequent patches), and set
per-processor event bits. Once an event has been consumed by the
kernel, we clear that event from out pending set, and send any further
pending events.

Certain events (hardware attentions from the psi layer) need to be
masked at interrupt time. For these, we have an acknowledgement facility
to clear the mask once the userspace PRD application has cleared the
source of the error.

Includes multiple contributions from:

  Neelesh Gupta <neelegup@linux.vnet.ibm.com>
  Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/psi.c b/hw/psi.c
index b96cb0f..baba154 100644
--- a/hw/psi.c
+++ b/hw/psi.c
@@ -298,7 +298,7 @@ static void handle_extra_interrupt(struct psi *psi)
 		p8_i2c_interrupt(psi->chip_id);
 	}
 	if (val & PSIHB_IRQ_STAT_LOCAL_ERR)
-		printf("PSI: ATTN irq received\n");
+		prd_psi_interrupt(psi->chip_id);
 	if (val & PSIHB_IRQ_STAT_HOST_ERR) {
 		if (platform.external_irq)
 			platform.external_irq(psi->chip_id);